54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
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#include <stdbool.h>
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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static struct spi_flash_if spif;
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static void clock_setup(void)
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{
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rcc_clock_setup_pll(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);
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rcc_periph_clock_enable(RCC_GPIOA);
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rcc_periph_clock_enable(RCC_GPIOB);
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rcc_periph_clock_enable(RCC_SPI1);
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}
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static void led_setup(void)
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{
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gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO6 | GPIO7);
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}
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static void spi_flash_if_set_cs(bool val) {
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if (val)
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gpio_set(GPIOB, GPIO0);
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else
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gpio_clear(GPIOB, GPIO0);
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}
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static void spi_flash_setup(void)
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{
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gpio_mode_setup(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO3 | GPIO4 | GPIO5); /* SPI flash SCK/MISO/MOSI */
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gpio_mode_setup(GPIOB, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO0); /* SPI flash CS */
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gpio_set_output_options(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO0 | GPIO3 | GPIO4 | GPIO5);
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gpio_set_af(GPIOB, 5, GPIO3 | GPIO4 | GPIO5);
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spi_init(&spif, SPI1, &spi_flash_if_set_cs);
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}
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int main(void)
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{
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clock_setup();
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led_setup();
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spi_flash_setup();
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gpio_set(GPIOA, GPIO6);
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while (1) {
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gpio_toggle(GPIOA, GPIO6 | GPIO7);
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for (int i = 0; i < 6000000; i++)
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__asm__("nop");
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}
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return 0;
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}
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